I'm looking export historic data on a per realm basis? I want to develop historic player trends and patterns toy model for post cata release predictions.
The entire dump would be fantastic, but if I had to pick specific fields, it would be faction, date, time, class, lvl, guild.
My purpose would be to chart a server population in relation to holidays, launch events, world events, seasons, and space between launches.

I'm sure that it would be a huge dump, but would only have to be done once, and have many other applications for its use by other people.